No wonder this started rattling!
 

Car is in the shop for an engine rebuild and transmission swap. Thought the issue was a worn thrust bearing (which it was) but then they found this! Opinions?

Well your not rebuilding those two roller lifters if that’s what your eluding to?

What you want to do now is confirm that those two lifter bores are still usable by placing a good lifter in them and comparing the clearance and how they feel when traveling up & down those two bores.

Those roller cams are nothing but trouble :)

(The HFT Clan)

I've seen the consensus on this site go from everyone had to have a 462 with 041 cam and rhoads lifters to everyone has to have old faithful roller camshaft to OMG where is the good roller lifters mine tick or are falling apart

Glad I dont follow herds

Your extremely lucky your block is not busted lifter bore broken out

Remove and replace

Hey! I'm in a clan... :)



Frank

Dude, every time I see that face,https://forums.maxperformanceinc.com...ine=1507838785 I just loose it, omg, epic ! :pound:

As for your post... Word Up!, every word...

My sympathy to whittp.



Frank

Building my spare engine, and still on the fence for big HYD FT vs SMALL Roller cam.

Sorry to hear of your trouble whittp. Seems another link bar roller retrofit bites the dust. I am pointing this out because there are guys posting these lifters are trouble free which they are not. Far from it actually and these lifters are expensive to boot so not sure the juice is worth the squeeze.

I would like to thank Jim Hand for banging the 041 on a 1.65:1 rocker arm drum to avoid all the problems we are now seeing. I bet the farm Pontiac engineers would have never used or approved the link-bar retro-fits for use in a production setting because of the warranty nightmare it would have caused.

Jim didn't sell you parts and knows what he is talking about.

Same here HIS. If you never drive it I'd go roller as it cool to say you have a roller motor even know the bearings are not.

Always wanted a BMW :D

Sorry for your mess. I would send that pic and lifters back to the manufacture. What do you think happen did the link bar fail and let the lifter go or did the lifter start floating and bind up the link bar causing it to break

I see the STREET roller in a Pontiac as the delicate balarena that may or may not break a toe the next dance while flat tappet is out there break dancing crushing it for years

The thing that drove people from STREET flat tappet was a change in motor oil that's been resolved, And lifter / cam quality
Choose wisely

I have never lost a flat cam prematurely

.

Wow it had to be running bad and down 50 hp.

Did it hurt the cam can’t tell from pictures?

OMG there it is again https://forums.maxperformanceinc.com...ine=1507838785 Bwahahaha ! You gotta tell me where you got that eventually.

I've never lost a cam prematurely either, luck? Perhaps, but I'm kinda in luv with Lunati stuff too.

Edit - As mentioned my sympathy to whittp, hope you find the cause, and grateful it didn't cost you more.



Frank

What should I do now? I would think I would have to go with the same cam (yes, the cam is compromised) and lifters since the build is pretty heavily modified. The Eheads flow about 305 cfm and the rpm intake is port matched and so forth. The cam is the Comp 51-433-9.

The engine made 532 hp and 578 tq last time it was on a dyno. It's in a new shop now (prior builder has retired) and now is the time to do it if I can make some changes to keep the engine more reliable.

I love how the engine performed and I'd like to keep it that way if possible.

BTW, this is the same car that the 200r4 torque converter ballooned and trashed the thrust bearing. It's getting a TKX swap now.

Boy you're just having an array of problems.

Would help to know which lifters those are. They look like the Comps that Paul has always complained about.

Comp 857 Lifters

That's what I figured.

Pic looks like it did get the lobe a bit, so a new cam is in order.

Would I have the option of changing to flat tappet cam and lifters while keeping my same rockers and push rods? I don't have the specs in front of me right now I attached a picture maybe that'll help.

Dam that's a Piss off. Not sure I can say that. but. Sorry for your issues. I've used the 847 lifters in the pass with no issues. I run the Crower solid lifter with the hydraulic cam. No issues to date. All street driven. We have the Johnson hydraulic lifters in another engine and no issues with them either.

Charles